Half of the string lights don't light up?

If half of the string lights are on and half are not, it may be caused by the following reasons:
1. Damaged bulbs: The bulbs in the string lights may have been damaged, causing half of them to not light up. You can check whether each bulb has black spots or cracks. If so, you need to replace the bulbs.
2. Poor contact: There may be problems with the connection of the string lights, causing the current to not flow normally. You can check whether the connection of each bulb is firm, loose or corroded. If so, you need to reconnect or replace the connector.
3. Line fault: There may be a fault in the line of the string lights, causing the current to not flow normally. You can check whether the line is broken or short-circuited. If so, you need to repair or replace the line.
4. Power supply problem: There may be a problem with the power supply of the string lights, causing the current to be unstable or unable to be supplied normally. You can check whether the power supply is working properly, whether there is unstable voltage or loose power plug. If so, you need to replace the power supply or repair the power plug.

Here are some possible repair methods:
1. Replace the bulb: If the bulb is damaged, you can buy a bulb of the same specification for replacement. When replacing the bulb, you need to pay attention to the polarity of the bulb to ensure correct installation.
2. Reconnect: If the connection is poor, you can reconnect the connector of each bulb to ensure that the connection is firm. If the connector is corroded or damaged, the connector needs to be replaced.
3. Repair the line: If the line is faulty, you can use insulating tape or wire repair tools to repair the broken or short-circuited line. When repairing the line, you need to make sure that the line is connected correctly and well insulated.
4. Replace the power supply: If there is a power problem, you can replace the power supply or repair the power plug. When replacing the power supply, you need to make sure that the voltage and current of the power supply match the requirements of the string lights.

It should be noted that when repairing the string lights, you need to disconnect the power supply first to avoid electric shock accidents. If you are not sure how to repair the string lights, it is recommended that you seek help from professionals.